Gallon (US liquid) to Gallon (imperial) Converter
1 US gallon is about 0.8326741846 imperial gallons. Convert US gallons (gal) to imperial gallons (imp gal) below: type a value and the result updates as you type.
gal to imp gal calculator
Result
Gallon (US liquid) to Gallon (imperial) conversion
1 gal ≈ 0.8326741846 imp galone US gallon in imperial gallons
1 imp gal ≈ 1.200949926 galone imperial gallon in US gallons
Gallon (US liquid) (gal): Exactly 231 cubic inches (3.785411784 liters).
Gallon (imperial) (imp gal): Exactly 4.54609 liters.
Source:Gallon (US liquid): NIST Special Publication 811 (2008), Appendix B.8 (US liquid measures derive from the exact 231 cubic inch gallon); Gallon (imperial): Weights and Measures Act 1985 (UK): imperial gallon = 4.54609 liters
How to convert US gallons to imperial gallons
To convert US gallons to imperial gallons, multiply the number of US gallons by about 0.8326741846.
Formula
imp gal = gal × 0.8326741846
The factor is rounded here. The calculator uses the exact value.
Examples
- 5 gal = 5 × 0.8326741846 ≈ 4.163370923 imp gal
- 25 gal = 25 × 0.8326741846 ≈ 20.81685462 imp gal
- 100 gal = 100 × 0.8326741846 ≈ 83.26741846 imp gal
Gallon (US liquid) to Gallon (imperial) conversion table
| Gallon (US liquid) (gal) | Gallon (imperial) (imp gal) |
|---|---|
| 0.1 gal | 0.08326741846 imp gal |
| 0.5 gal | 0.4163370923 imp gal |
| 1 gal | 0.8326741846 imp gal |
| 2 gal | 1.665348369 imp gal |
| 3 gal | 2.498022554 imp gal |
| 5 gal | 4.163370923 imp gal |
| 10 gal | 8.326741846 imp gal |
| 20 gal | 16.65348369 imp gal |
| 25 gal | 20.81685462 imp gal |
| 50 gal | 41.63370923 imp gal |
| 100 gal | 83.26741846 imp gal |
| 250 gal | 208.1685462 imp gal |
| 500 gal | 416.3370923 imp gal |
| 1000 gal | 832.6741846 imp gal |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many imperial gallons are in one US gallon?
- One US gallon is about 0.8326741846 imperial gallons.
- How do I convert imperial gallons to US gallons?
- To convert imperial gallons to US gallons, multiply the number of imperial gallons by about 1.200949926. The formula is gal = imp gal × 1.200949926.
- Is this conversion exact?
- Yes. Both units have exact definitions, but the factor has more decimal places than can be shown, so displayed results are rounded. The calculator works with 50 significant digits before rounding.
- Which is larger, a US gallon or a imperial gallon?
- A imperial gallon is about 1.200949926 times larger than a US gallon. In other words, a US gallon is about 0.8326741846 of a imperial gallon.